CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Net revenues	$ 419,024	$ 410,969	$ 850,196	$ 766,689
Cost of revenues	239,331	230,223	495,313	429,611
Gross profit	179,693	180,746	354,883	337,078
Operating expenses
Research, development, and engineering	44,407	52,148	89,873	102,177
Selling, general, and administrative	122,297	115,605	243,031	232,250
Loss, net from litigation settlements	0	0	0	17,561
Restructuring and other related charges	2,607	6,170	31,579	35,500
Total operating expenses	169,311	173,923	364,483	387,488
Operating income (loss)	10,382	6,823	(9,600)	(50,410)
Interest expense	16,141	18,581	37,923	39,765
Other non-operating expense (income), net	23	(1,366)	(668)	(1,592)
Loss before income taxes	(5,782)	(10,392)	(46,855)	(88,583)
Income tax (benefit) expense	(102,567)	3,013	(106,829)	(163)
Net income (loss)	$ 96,785	$ (13,405)	$ 59,974	$ (88,420)
Per share data
Basic (in dollars per share)	$ 2.27	$ (0.33)	$ 1.42	$ (2.17)
Diluted (in dollars per share)	$ 2.21	$ (0.33)	$ 1.37	$ (2.17)
Basic (in shares)	42,543	40,970	42,302	40,715
Diluted (in shares)	43,705	40,970	43,863	40,715
Product
Net revenues	$ 361,383	$ 347,677	$ 732,585	$ 639,135
Cost of revenues	220,169	209,261	455,365	385,876
Service
Net revenues	57,641	63,292	117,611	127,554
Cost of revenues	$ 19,162	$ 20,962	$ 39,948	$ 43,735